reference/network/functions/headers-sent.xml
b4989f5c1f052314ff2c36e9cc3d56b3a7a24e9b
b4989f5c1f052314ff2c36e9cc3d56b3a7a24e9b
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and line number where output started in the <parameter>filename</parameter>
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and <parameter>line</parameter> variables.
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</para>
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<note>
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<para>
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If the output has started before executing the PHP source file (for example due to a startup error),
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the <parameter>filename</parameter> parameter will be set to an empty string.
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</para>
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</note>
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</listitem>
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</varlistentry>
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<varlistentry>
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